How to Adjust the Pressure in a Lawn Genie L7034 Anti-Siphon Irrigation Valve

The Lawn Genie L7034 Anti-Siphon Valve is equipped with a flow-control screw so you can easily adjust the rate the sprinklers emit water. The flow-control screw adjusts the amount of water pressure that goes to the sprinkler zone serviced by the valve. If the pressure is too high when the water gets to the sprinklers, it will result in misting or fogging around the sprinkler heads. This misting means higher water usage and more water on the lawn near the sprinkler head. You can adjust the flow rate from 0.25 to 25 gallons per minute.


Turn off the water supply that goes to the anti-siphon valve.


Open the cover of the box containing the ant-siphon valve, if the valve is contained in a box.


Locate the flow-control screw, the larger of the two black screws on the side of the valve next to the solenoid. The solenoid is the black cylinder with the wires emerging from the top.


Turn the flow-control screw clockwise using the screwdriver until the screw stops turning. This will close the valve.


Turn the water supply back on.


Locate the manual-bleed screw, the smaller of the two black screws near the solenoid.


Turn the manual-bleed screw counterclockwise using the screwdriver until water flows through the valve.


Turn the flow-control screw slowly until the you get the desired flow rate.


Turn the manual-bleed screw clockwise to tighten the screw and close the valve.

Things Needed

  • Screwdriver


  • Keep your valve inside a box to keep the plastic from deteriorating from exposure to the sun and elements.


Photo Credits

  • Jupiterimages/ Images

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